scholarly journals Hg2+ Optical Fiber Sensor Based on LSPR Generated by Gold Nanoparticles Embedded in LBL Nano-Assembled Coatings

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4906 ◽  
Author(s):  
María Elena Martínez-Hernández ◽  
Javier Goicoechea ◽  
Francisco J. Arregui
Keyword(s):  
Gold Nanoparticles ◽  
Optical Fiber Sensor ◽  
The Body ◽  
Fiber Optic Sensor ◽  
Localized Surface Plasmon ◽  
Layer By Layer ◽  
Localized Surface Plasmon Resonances ◽  
Highly Sensitive ◽  
Assembly Technique

Mercury is an important contaminant since it is accumulated in the body of living beings, and very small concentrations are very dangerous in the long term. This paper reports the fabrication of a highly sensitive fiber optic sensor using the layer-by-layer nano-assembly technique with gold nanoparticles (AuNPs). The gold nanoparticles were obtained via a water-based synthesis route that use poly acrylic acid (PAA) as stabilizing agent, in the presence of a borane dimethylamine complex (DMAB) as reducing agent, giving PAA-capped AuNPs. The sensing mechanism is based on the alteration of the Localized Surface Plasmon Resonances (LSPR) generated by AuNPs thanks to the strong chemical affinity of metallic mercury towards gold, which lead to amalgam alloys.

An Optical Fiber Sensor for Hg2+ Detection Based on the LSPR of Silver and Gold Nanoparticles Embedded in a Polymeric Matrix as an Effective Sensing Material

2021 ◽  
Vol 5 (1) ◽  
pp. 73
Author(s):  
María Elena Martínez-Hernández ◽  
Xabier Sandua ◽  
Pedro J. Rivero ◽  
Javier Goicoechea ◽  
Francisco J. Arregui
Keyword(s):  
Gold Nanoparticles ◽  
Optical Fiber ◽  
Localized Surface Plasmon Resonance ◽  
Spectral Response ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Localized Surface Plasmon ◽  
Layer By Layer ◽  
Sensing Material ◽  
Reliable Monitoring

In this work, an optical fiber sensor based on the localized surface plasmon resonance (LSPR) phenomenon is presented as a powerful tool for the detection of heavy metals (Hg2+). The resultant sensing film was fabricated using a nanofabrication process, known as layer-by-layer embedding (LbL-E) deposition technique. In this sense, both silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) were synthesized using a synthetic chemical protocol as a function of a strict control of three main parameters: polyelectrolyte concentration, loading agent, and reducing agent. The use of metallic nanostructures as sensing materials is of great interest because well-located absorption peaks associated with their LSPR are obtained at 420 nm (AgNPs) and 530 nm (AuNPs). Both plasmonic peaks provide a stable real-time reference that can be extracted from the spectral response of the optical fiber sensor, giving a reliable monitoring of the Hg2+ concentration.

scholarly journals The external environment of birds as a factor of immunobiochemical conditions

2020 ◽  
Vol 9 (3) ◽  
pp. 152-157
Author(s):  
Rinat R. Fatkullin ◽  
Aikumis K. Saken
Keyword(s):  
Metabolic Disorders ◽  
Clinical Manifestations ◽  
The Body ◽  
Household Waste ◽  
Trophic Chain ◽  
Behavioral Strategies ◽  
The Public ◽  
Initial Stage ◽  
Highly Sensitive

Abnormal environmental factors contribute to advanced behavioral strategies in higher regulatory centers as well as to the assessment of possible morphofunctional and energy transformations in the body. Animals, especially birds, which are characterized by curiosity, are highly sensitive to the presence of environmental pollution, since they interact with elements of the environment and surroundings. Contamination of broiler products can also be caused by contaminated soil and dust, unknown sources of persistent heavy metals and organic pollutants that are unknown to the public, such as car wreckage, household waste, and so on. In general, adverse factors that regularly affect small details do not require significant changes in the body at the initial stage, mainly affect non-specific mechanisms that lead to long-term activation. The paper contains significant work based on the analysis of microbiogenic links in the trophic chain, but the formation of processes associated with metabolic disorders from the development of trace elements to clinical manifestations is still insufficiently studied, so it is difficult to diagnose and treat previously unknown animal diseases in veterinary practice.

scholarly journals Quasi-fractal Gold Nanoparticles for Sers: Effect of Nanoparticle Morphology and Concentration

2018 ◽  
Author(s):  
Richard Darienzo ◽  
Olivia Chen ◽  
Maurinne Sullivan ◽  
Tatsiana Mironava ◽  
Rina Tannenbaum
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon ◽  
Laser Wavelength ◽  
Localized Surface Plasmon ◽  
Strong Absorption Band ◽  
Surface Features ◽  
Localized Surface Plasmon Resonances ◽  
Nanoparticle Interactions ◽  
Oscillation Modes ◽  
Nanoparticle Morphology

<p>Quasi-fractal gold nanoparticles can be synthesized via a modified and temperature controlled procedure initially used for the synthesis of star-like gold nanoparticles. The surface features of nanoparticles leads to improved enhancement of Raman scattering intensity of analyte molecules due to the increased number of sharp surface features possessing numerous localized surface plasmon resonances (LSPR). The LSPR is affected by the size and shape of surface features as well as inter-nanoparticle interactions, as these affect the oscillation modes of electrons on the nanoparticle surfaces. The effect of the particle morphologies on the LSPR and further on the surface-enhancing capabilities of these nanoparticles is explored by comparing different nanoparticle morphologies and concentrations. We show that in a fixed nanoparticle concentration regime, Quasi-fractal gold nanoparticles provide the highest level of surface enhancement, whereas spherical nanoparticles provide the largest enhancement in a fixed gold concentration regime. The presence of highly branched features enables these nanoparticles to couple with a laser wavelength despite having no strong absorption band and hence no single surface plasmon resonance. This cumulative LSPR may allow these nanoparticle to be used in a variety of applications where laser wavelength flexibility is beneficial, such as in medical imaging applications where fluorescence at short laser wavelengths may be coupled with non-fluorescing long laser wavelengths for molecular sensing. </p>

scholarly journals The highly sensitive determination of serotonin by using gold nanoparticles (Au NPs) with a localized surface plasmon resonance (LSPR) absorption wavelength in the visible region

RSC Advances ◽  
2020 ◽  
Vol 10 (51) ◽  
pp. 30858-30869
Author(s):  
Phuong Que Tran Do ◽  
Vu Thi Huong ◽  
Nguyen Tran Truc Phuong ◽  
Thi-Hiep Nguyen ◽  
Hanh Kieu Thi Ta ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Visible Region ◽  
Localized Surface Plasmon ◽  
Au Nps ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Sensitive Determination

The development of improved methods for the synthesis of monodisperse gold nanoparticles (Au NPs) is of high priority because they can be used as substrates for surface-enhanced Raman scattering (SERS) applications relating to biological lipids.

A reagentless electrochemical immunosensor based on probe immobilization and the layer-by-layer assembly technique for sensitive detection of tumor markers

2015 ◽  
Vol 7 (22) ◽  
pp. 9655-9662 ◽  
Author(s):  
Cong Qiumei ◽  
Bian Hongmei ◽  
Yu Zhaoxia ◽  
Jiyang Liu ◽  
Fengna Xi
Keyword(s):  
Carcinoembryonic Antigen ◽  
Tumor Markers ◽  
Electrochemical Immunosensor ◽  
Sensitive Detection ◽  
Layer By Layer ◽  
Layer By Layer Assembly ◽  
Highly Sensitive ◽  
Assembly Technique ◽  
Highly Sensitive Detection ◽  
Layer Assembly

Combined with surface-confined probes and the layer-by-layer assembly technique, a reagentless electrochemical immunosensor was constructed for highly sensitive detection of carcinoembryonic antigen.

scholarly journals Quasi-fractal Gold Nanoparticles for Sers: Effect of Nanoparticle Morphology and Concentration

2018 ◽  
Author(s):  
Richard Darienzo ◽  
Olivia Chen ◽  
Maurinne Sullivan ◽  
Tatsiana Mironava ◽  
Rina Tannenbaum
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon ◽  
Laser Wavelength ◽  
Localized Surface Plasmon ◽  
Strong Absorption Band ◽  
Surface Features ◽  
Localized Surface Plasmon Resonances ◽  
Nanoparticle Interactions ◽  
Oscillation Modes ◽  
Nanoparticle Morphology

<p>Quasi-fractal gold nanoparticles can be synthesized via a modified and temperature controlled procedure initially used for the synthesis of star-like gold nanoparticles. The surface features of nanoparticles leads to improved enhancement of Raman scattering intensity of analyte molecules due to the increased number of sharp surface features possessing numerous localized surface plasmon resonances (LSPR). The LSPR is affected by the size and shape of surface features as well as inter-nanoparticle interactions, as these affect the oscillation modes of electrons on the nanoparticle surfaces. The effect of the particle morphologies on the LSPR and further on the surface-enhancing capabilities of these nanoparticles is explored by comparing different nanoparticle morphologies and concentrations. We show that in a fixed nanoparticle concentration regime, Quasi-fractal gold nanoparticles provide the highest level of surface enhancement, whereas spherical nanoparticles provide the largest enhancement in a fixed gold concentration regime. The presence of highly branched features enables these nanoparticles to couple with a laser wavelength despite having no strong absorption band and hence no single surface plasmon resonance. This cumulative LSPR may allow these nanoparticle to be used in a variety of applications where laser wavelength flexibility is beneficial, such as in medical imaging applications where fluorescence at short laser wavelengths may be coupled with non-fluorescing long laser wavelengths for molecular sensing. </p>

scholarly journals Self-Referenced Optical Fiber Sensor for Hydrogen Peroxide Detection based on LSPR of Metallic Nanoparticles in Layer-by-Layer Films

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3872 ◽  
Author(s):  
Goicoechea ◽  
Rivero ◽  
Sada ◽  
Arregui
Keyword(s):  
Hydrogen Peroxide ◽  
Optical Fiber ◽  
Metallic Nanoparticles ◽  
Low Cost ◽  
Spectral Response ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Localized Surface Plasmon ◽  
Layer By Layer ◽  
Robust Detection

Intensity-based optical fiber sensors are one of the most studied sensor approaches thanks to their simplicity and low cost. Nevertheless, their main issue is their lack of robustness since any light source fluctuation, or unexpected optical setup variation is directly transferred to the output signal, which, significantly reduces their reliability. In this work, a simple and robust hydrogen peroxide (H2O2) optical fiber sensor is proposed based on the Localized Surface Plasmon Resonance (LSPR) sensitivity of silver and gold metallic nanoparticles. The precise and robust detection of H2O2 concentrations in the ppm range is very interesting for the scientific community, as it is a pathological precursor in a wide variety of damage mechanisms where its presence can be used to diagnose important diseases such as Parkinson’s disease, diabetes, asthma, or even Alzheimer’s disease). In this work, the sensing principle is based the oxidation of the silver nanoparticles due the action of the hydrogen peroxide, and consequently the reduction of the efficiency of the plasmonic coupling. At the same time, gold nanoparticles show a high chemical stability, and therefore provide a stable LSPR absorption band. This provides a stable real-time reference that can be extracted from the spectral response of the optical fiber sensor, giving a reliable reading of the hydrogen peroxide concentration.

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